JP2003181562A - Cylindrical drum flange processing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical drum flange processing machine processing a notch area on both ends of the cylindrical drum with excellent positional accuracy, for achieving a photoreceptor drum unit which can smoothly be driven with less load fluctuation to obtain a clear image free from severe picture distortion. <P>SOLUTION: The processing machine simultaneously can process notches on both ends of the cylindrical drum by integrally holding punch and a dice to enhance the positional accuracy of them. Additionally the dice is provided on the side face of a cast fitting with the inner face of the photoreceptor drum to set the blade of the punch to the same curvature as that of the cylindrical drum outer diameter, allowing a dice holding member integrally holding both the punch and the dice to slide. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical drum end processing machine such as a photosensitive drum unit applicable to a printer or a facsimile. 2. Description of the Related Art As an example of a conventional electrophotographic developing apparatus,
There is one disclosed in JP-A-6-43759. An image forming unit to which this electrophotographic developing device is applied is shown in FIG.
This will be described with reference to FIG. In FIG. 8, reference numeral 1 denotes a laminated photosensitive drum in which an organic photosensitive member in which phthalocyanine is dispersed in a polyester-based binder resin is coated on a cylindrical aluminum tube having a diameter of 30 mm and a thickness of 0.8 mm. Then, a driving force is obtained from an electrophotographic developing device main body (not shown) to rotate in the direction of the arrow. Reference numeral 2 denotes a non-rotating magnet fixed coaxially with the photosensitive drum 1. 3 is a corona charger for negatively charging the photoconductor, 4 is a grid electrode for controlling the charging potential of the photoconductor, 5 is a laser signal light, 6 is a toner hopper, 7
Denotes a magnetic one-component toner, 8 denotes a non-magnetic electrode roller formed of an aluminum cylinder having a diameter of 16 mm and a thickness of 0.8 mm, which is disposed with a gap from the photosensitive drum 1, and 9 denotes a roller disposed inside the electrode roller 8. A non-rotating magnet, 10 an AC high-voltage power supply for applying a voltage to the electrode roller 8, 11 a phosphor bronze scraper for scraping off the toner on the electrode roller 8, 12 a toner 7 in the toner hopper 6 to the photosensitive drum 1. A supply agitator, 13 is a transfer roller, and 14 is a cleaner. [0004] The image forming process of the image forming unit of each component will be briefly described. 32.5 photoconductor drum 1
mm / s at a speed of -500 with a corona charger 3.
V is charged. The photosensitive drum 1 is irradiated with a laser beam 5 to form an electrostatic latent image. The magnetic toner 7 is adhered to the surface of the photosensitive drum 1 by the magnetic force in the toner hopper 6 using the magnetic force of the magnet 2. Next, the photosensitive drum 1 is passed in front of the electrode roller 8. When passing through the photosensitive drum 1 on which the electrostatic latent image is written by being charged to −500 V, the electrode roller 8 is supplied with an AC high voltage power supply 10 by −30 V.
An 800 V0-p (peak-to-peak 1.6 kV) AC voltage (frequency 3 kHz) superimposed with a 0 V DC voltage is applied. Then, the toner adhering to the charged portion of the photosensitive drum 1 is collected by the electrode roller 8, and the negative-positive toner image remains on the photosensitive drum 1 only in the image area. The toner image on the photosensitive drum 1 is transferred to paper (not shown) by the transfer roller 13, and the transfer residual toner is cleaned by the cleaner 14, and is transferred to the next image forming step. The toner adhered to the electrode roller 8 rotating in the direction of the arrow is scraped off by the scraper 11, returned to the toner hopper 6 again, and used for the next image formation. Next, the configuration of the driving mechanism of the image forming unit will be described. FIG. 9 is a perspective view showing a main part of the drive system by cutting out only necessary parts of the image forming unit. The drive gear 21 is a helical gear, and is provided in the main body of the electrophotographic developing device. When the image forming unit is mounted on the main body of the electrophotographic developing device, the driving gear 21 is fixed to one end of the photosensitive drum 1 as shown in FIG. The driving force is transmitted to the image forming unit by engaging with the photoconductor gear 22. The number of teeth of the photoreceptor gear 22 is 32 in the module 0.9. Photoconductor drum 1
A roller driving gear 23 as a developing driving gear is fixed to the other end of the roller gear 25. By this, a driving force is applied to the roller gear 25 fixed to one end of the electrode roller 8 through the intermediate gear 24.
To communicate. The teeth of the roller drive gear 23 are the module 0.
8, the number of teeth is 32. As described above, the driving force is transmitted from the main body of the electrophotographic developing device to the photosensitive drum 1 and the electrode roller 8, and the photosensitive drum 1 rotates in the direction of arrow A in FIG. Driven. [0006] However, when an image is formed by this image forming unit, it is good or bad for each photosensitive drum 1. I found something. A good photosensitive drum 1 can provide a uniform image, while a bad photosensitive drum 1 results in a distorted image with a lot of jitter due to partial speed fluctuations. In addition, even if the image was uniform at the beginning, repeated images sometimes resulted in a distorted image with much jitter. [0008] Further development has revealed that the development is as follows. That is, the photosensitive drum 1 in the image forming unit has a load variation that occurs in a cycle of 32 times per revolution corresponding to the number of teeth of each gear. Then, as the entire load fluctuation, the load fluctuation due to each gear is combined. Accordingly, since the combined load fluctuations are different depending on the relative phases when the photoconductor gear 22 and the roller drive gear 23 are attached to the photoconductor drum 1, a good photoconductor drum 1 and a bad photoconductor drum 1 can be formed. In the photosensitive drum 1 from which a uniform image can be obtained, the phases of the photosensitive gear 22 and the roller driving gear 23 are 2
It is shifted by a pitch of 1 / min, and cancels the load fluctuation with each other. Conversely, the photosensitive drums 1 having a large amount of jitter have the same phase, and the load fluctuations are mutually intensified. Also, even if the image was initially uniform, the repeated image cycle would result in a jittery and distorted image because the adhesive surface between the inner surface of the photosensitive drum 1 and the gear was displaced during the print cycle. It was found that the mutual phases of the gears changed. The present invention solves the above-mentioned problem, and provides a cylindrical drum end processing machine which is optimal for processing the end of a cylindrical drum such as a photosensitive drum capable of obtaining a beautiful image with little jitter. It is intended for that purpose. [0011] In order to solve the above problems, the present invention is a cylindrical drum end processing machine for processing the end of a cylindrical drum, which is fitted on the inner peripheral surface of the cylindrical drum. A cylindrical fitting portion to be fitted, a die provided on the outer peripheral surface of the fitting portion, and the cylindrical drum provided on the fitting portion and in contact with an end of the fitted cylindrical drum. A positioning member for positioning the punch, a punch having a blade shape having a curvature corresponding to the outer diameter of the cylindrical drum, and holding the punch slidably in the direction of insertion and removal from the die, and the die provided A pair of dice holding members, which are installed so as to hold the fitted fitting portion at a predetermined position and face each other so that the center axes of the fitting portions coincide with each other, and fit only one of the dice holding members. X axis along the central axis of the joint A first sliding means for slidably holding in a direction, a second sliding means for slidably holding both die holding members in a Y-axis direction orthogonal to the X-axis, and a punching press for pressing the punch at a predetermined position. And a pair of punching press holding members. The cylindrical drum processing machine according to the present invention has a structure in which the punch and the die are integrally held to improve the positional accuracy of both, and that the notches at both ends of the cylindrical drum can be cut at the same time. Therefore, not only the processing time is shortened, but also the stress acts uniformly on both ends of the cylindrical drum, and the positional accuracy of the notch can be improved. Therefore, the phases of the gears can be accurately adjusted. Also,
The die is provided on the side of the cylinder that fits on the inner surface of the photoreceptor drum, and the punch blade is made to have the same curvature as the outer diameter of the cylindrical drum, so deformation of the cylindrical drum and generation of burrs around the notch Absent. Therefore, the position accuracy with respect to the opposing developing device is improved, and a uniform image can be printed.
In addition, since the die holding member that integrally holds the punch and the die is slid, it is easy to mount and detach the cylindrical drum. Embodiments of the present invention will be described below with reference to the drawings. First, an example of a cylindrical drum end processing machine that cuts out both ends of a cylindrical drum will be described with reference to FIGS. 1 is a perspective view showing a cylindrical drum end processing machine of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a right side view thereof, and FIG. 4 is a perspective view showing a positional relationship between a die, a punch and a cylindrical drum end. It is. In this embodiment, the case where the photosensitive drum 1 is processed as a cylindrical drum will be described, and those having the same functions as those in the related art will be denoted by the same reference numerals. In FIG. 1, 50 and 51 are dies 54,
A die holding member for holding the die 55 and the punches 56 and 57, and the dies 54 and 55 and the punches 56 and 57, respectively.
Are integrally attached by the die holding members 50 and 51. The die holding member 50 is provided fixed to a movable base 81 on a fixed base 80. The central portion of the movable base 81 is connected to the retraction pump 66,
It is slidable in the Y-axis direction. The holding member 51 is fixed to a movable base 82 on the movable base 81. The movable base 82 is slidable in the X-axis direction in FIG. Numerals 52 and 53 denote cylindrical fitting portions fitted to the inner surface of the photosensitive drum 1. The cylindrical surfaces of the fitting portions 52 and 53 have dies 5 having a curvature corresponding to the inner surface of the photosensitive drum 1.
4 and 55 are provided. 62, 63 are stoppers for stopping the end portions of the photosensitive drum 1;
3 on the side. Stoppers 62, 63
Thus, the end of the photosensitive drum 1 is positioned with respect to the dies 54 and 55. As shown in FIG. 4, the punch 57 is slidable along a guide cylinder 70 held by the die holding member 51. Punches 56, 57
When the upper end portions 60, 61 of the are pressed from above at 12 o'clock, the positions of the blades are adjusted so that they respectively engage with the dies 54, 55 at the same time. Springs 58, 59 are provided above the dies 54, 55, and the punches 56,
The punches 56, 57 and the dies 54, 55 are engaged only when the upper ends 60, 61 of the 57 are pressed from above, and the blades of the punches 56, 57 are normally urged upward by springs 58, 59 to guide the guide cylinder 69. , 70 are accommodated. Reference numerals 83 and 84 denote punching press holding members for holding punching presses 85 and 86. The punching presses 85 and 86 are provided at upper end portions 6 of punches 56 and 57, respectively.
Press 0,61. Punching press holding member 8
Stoppers 64, 65 for positioning the movable base 81 in the Y-axis direction are provided at one lower end of the base plates 3, 84, and the punching press 85,
86 is positioned so as to be a position where the upper ends 60 and 61 of the punches 56 and 57 are pressed. The overall configuration of the cylindrical drum end processing machine will be described with reference to FIGS. The center axis direction of the cylindrical fitting portions 52 and 53 is defined as an X axis, the horizontal direction orthogonal to the X axis is defined as a Y axis, and the height direction is defined as a Z axis. The fixed base 80 has two slide rails (second slide means) 87 and 88 parallel to the Y-axis direction. The movable base 81 rides on slide rails 87 and 88, and is entirely movable in the Y-axis direction. Movable base 8
On the right side of 1, a slide rail (first slide means) 89 in the X-axis direction is provided, on which a movable base 82 rides. The die 5 is placed on the movable base 82.
The die holding member 51 that holds the punch 5 and the punch 57 is fixed. The central axes of the fitting portions 52 and 53 are adjusted by X, Y, and X by an adjustment mechanism (not shown) provided on the die holding member 51.
It is mounted so that both Z axes coincide. The notch processing of the end of the photosensitive drum 1 by the cylindrical drum end processing machine will be described. First, the end of the photosensitive drum 1 is inserted into the cylindrical fitting portion 52. When the movable base 82 is moved to the left in the X direction (see FIG. 2) along the slide rail 89 manually or by a predetermined driving means, the fitting portion 53 is fitted into the other end of the photosensitive drum 1, and Both ends of the drum 1 are drum stoppers 6
Contact 2 and 63. Fixing means (not shown) in this position
Thereby, the X-axis direction side of the die holding member 51 is fixed.
FIG. 4 shows the positional relationship between the right end of the photosensitive drum 1, the punch 57, the die 55, and the positioning stopper 63 in this state. The end of the photosensitive drum 1 is located at a predetermined position with respect to the die 53 and the punch 57. FIG.
Shows the state of the right end portion of the photosensitive drum 1, and the left end portion has the same positional relationship. When the start switches 67, 68 on the front surface of the cylindrical drum end processing machine are pressed with both hands, the retraction pump 66 is operated, and the movable base 81 moves in the Y-axis direction by air pressure. The position in the Y-axis direction is determined by contact. When the movable base 81 contacts the stoppers 64, 65, air is automatically sent to the punching presses 85, 86, and the upper ends 60, 61 of the punches 56, 57 are simultaneously pressed by the punching presses 85, 86. Then, both ends of the photosensitive drum 1 are cut out. When the processing is completed, the air from the punching presses 85 and 86 is evacuated, and the punches 56 and 57 are pulled up by the springs 58 and 59 and are accommodated in the guide cylinders 69 and 70. next,
Air in the opposite direction is blown into the retraction pump 66, and the movable base 81 is pushed forward (see FIG. 1) and stops at a stopper (not shown). Thereafter, the die holding member 51
After the fixing means is released and the die holding member 51 is moved to the right (see FIG. 1), the photoreceptor drum 1 is removed to complete the processing operation. The cut drum piece of the photosensitive drum 1 is discharged from a die hole passing through the fitting portions 52 and 53. This cylindrical drum end processing machine is characterized in that the blades of the dies 54 and 55 have a curvature equal to the inner diameter of the photosensitive drum 1, and the blades of the punches 56 and 57 are equal to the outer diameter of the photosensitive drum 1. Is to have a curvature. For this reason, there is no deformation of the photosensitive drum 1 due to the notch processing and no burr at the notch. The dies 54, 55 and the punches 56, 5
Since the die 7 is provided on the integrated die holding members 50, 51, the dies 54, 55 and the punches 56, 57 can be easily positioned. Further, since the pressing positions at both ends of the photosensitive drum 1 are simultaneously pressed, the notch position accuracy is good. The mutual positional error between the notches 30 and 31 at both ends by this cylindrical drum end processing machine was within 10 microns. The punches 56 and 57 and the dies 54 and 5
The die holding members 50 and 51 which integrally hold the holding member 5 are arranged so as to face each other, and one of the holding members 51 is connected to the center axis (X
The photosensitive drum 1 is attached and detached by sliding in the (axial) direction. At this time, the opposing die holding members 50, 51
Is located on the front surface of the cylindrical drum end processing machine. After the photosensitive drum 1 is mounted, the pair of dice holding members 50 and 51 are slid toward the punching presses 85 and 86. It is easy to attach and detach. As shown in FIG. 5, a first gear 22 which is a photosensitive gear and a second gear 23 which is a roller driving gear are provided at both ends of the photosensitive drum 1 whose ends are notched as described above.
To form the photosensitive drum unit 40. The first and second gears 22 and 23 shown in FIG. 5 are the same as the photoreceptor gear 22 and the roller drive gear 23 shown in FIG. 9, and the first gear 22 is a module 0.9 and a bevel having 32 teeth. Tooth gear,
The second gear 23 is a spur gear having a module of 0.8 and 32 teeth. The first and second gears 22 and 23 have positioning projections 3 corresponding to the notches 30 and 31 of the photosensitive drum 1.
2, 33 are provided. With reference to the positioning projections 32 and 33, the phases of the teeth of the first gear 22 and the second gear 23 are cut off by a half pitch. Therefore,
When the positioning projections 32 and 33 are aligned with the notches 30 and 31 provided opposite to the ends of the photosensitive drum 1, the phases of the first and second gears 22 and 23 at both ends are shifted by a half pitch. Attached. An adhesive is applied to fitting portions 34 and 35 between the first and second gears 22 and 23 and the inner diameter of the photosensitive drum 1 so as to prevent the gears from coming off in the axial direction. As described above, the first and second gears 22,
When the photosensitive drum unit 40 with the phases of the photosensitive drums 23 shifted by a half pitch was mounted on the process cartridge shown in FIG. 9 and an image was taken, a uniform and beautiful image was obtained over a long period of time. FIG. 6 shows the result of measuring the speed fluctuation of the photosensitive drum unit 40 in the process cartridge. As shown in FIG. 6, the first and second gears 2
A small speed fluctuation of about 1.5 mm pitch corresponding to a half pitch of 2,23 was observed, but no jitter due to the speed fluctuation was observed in the image. For comparison, the first gear 22 and the second gear 2
When a photoconductor drum unit with the teeth phases completely matched with that of the photoconductor drum 3 was mounted on a process cartridge shown in FIG. 8 and an image was taken, an image having a large jitter due to the speed fluctuation of the photoconductor drum unit was obtained. When the speed fluctuation of this photosensitive drum unit was measured, the result shown in FIG. 7 was obtained, and a large speed fluctuation of about 3 mm pitch corresponding to one pitch of the first and second gears 22 and 23 was recognized. The cylindrical drum end face processing machine of the present invention
This is effective not only for processing the end face of the photosensitive drum but also when it is necessary to attach a flange or gear to a cylindrical drum with high accuracy or a large load. Examples of application in electrophotographic devices include electrode rollers, developing sleeves,
It can be used for cylindrical end processing such as a resist roller for paper conveyance and a pressure roller for a heat fixing machine. As described above, according to the cylindrical drum end processing machine of the present invention, the notches at both ends can be processed with good operability and positional accuracy. According to the cylindrical drum end processing machine, it is possible to deform the cylindrical drum and to perform processing without burrs around the notch.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an outline of a cylindrical drum end processing machine according to an embodiment of the present invention. FIG. 2 is a front view of the cylindrical drum end processing machine. FIG. 4 is a right side view of the drum end processing machine. FIG. 4 is a perspective view showing a positional relationship between a cylindrical end, a punch, a die, and a positioning member at a right end of the cylindrical drum end processing machine. FIG. 6 is a perspective view showing a configuration of the photosensitive drum unit according to the first embodiment. FIG. 6 is a view showing a speed variation of the photosensitive drum unit when the photosensitive drum unit is mounted on the image forming unit. FIG. FIG. 8 is a perspective view showing a main part of a photosensitive drum unit driving unit of the image forming unit used in the embodiment. FIG. Uni 1 Photoconductor drum 22 First gear 23 Second gear 30, 31 Notch 32, 33 Projection 40 Photoconductor drum unit 50, 51 Dice holding member 54, 55 Dice 56, 57 Punch 62, 63 Stopper (positioning member) 81, 82 Movable base 83, 84 Punching press holding member 85, 86 Punching press 87, 88 Slide rail (second slide means) 89 Slide rail (first slide means)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 21/00 350 G03G 21/00 350 (72) Inventor Keizo Takeuchi 1006 Kadoma Kadoma, Kazuma, Osaka Matsushita Electric Hiroshi Yasumoto, Inventor Hiroshi Yasumoto, 1006 Kadoma, Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Hirozo Ezawa 1006, Kadoma, Kazuma, Kadoma, Osaka Matsushita Electric Industrial Co., Ltd. (Reference) 2H035 CA07 CB03 CG03 2H171 FA02 FA07 FA09 FA30 GA01 GA08 GA15 JA02 JA23 JA27 JA29 JA31 KA12 KA23 LA08 LA09 PA02 PA12 PA13 PA14 QA02 QA08 QA11 QA13 QB02 QB15 QB32 QB35 QC03 QC22 QC36 SA04 KA02 KA36 KA04

Claims (1)

Claims 1. A cylindrical drum end processing machine for processing an end of a cylindrical drum, comprising: a cylindrical fitting portion fitted to an inner peripheral surface of the cylindrical drum; A die provided on the outer peripheral surface of the portion, a positioning member provided on the fitting portion and abutting against an end of the fitted cylindrical drum to position the cylindrical drum, and a positioning member outside the cylindrical drum. A punch having an edge shape having a curvature corresponding to a diameter, holding the punch slidably in a direction of inserting and removing from the die, and holding a fitting portion provided with the die at a predetermined position to fit the punch; A pair of dice holding members installed facing each other so that the central axes of the portions coincide with each other, and only one of the dice holding members is slidable in the X-axis direction along the central axis of the fitting portion. First sliding means for holding the first sliding means A second sliding means for slidably holding both die holding members in a Y-axis direction orthogonal to the X-axis, and a pair of punching press holding members holding a punching press for pressing the punch at a predetermined position; Drum end processing machine.